That's a sad story mate. Cheer up. Japan is a country with a very high level of life and good manners so your chances that a person won't be greedy are very high. However that's hellofacostly player. One can probably buy a used car if he sells it so... but.. I would post on some japanese highly popular imageboards like 2chan where you have a much bigger chance that the guy finds you. Try to contact some japanese head-fi members which can translate your message in post in an appropriate thread.
I'm sorry to hear about this. It could happen to any of us, so don't beat yourself up over it.
While it sucks now, look at the bigger picture: the fact that you were in a position to own the SSAK240 means you're in a relatively good place financially compared to so much of the population. Further to that you figured out how to get the money to source and purchase the player before and you will again.
Lastly, in a few years time this would have been a distant memory and you'll be enjoying something else.
Sorry for your loss and hope you get your player back
But I don't understand why you put your player in a 'brown bag with food in it' . Knowing that your on the way to the airport surely u should have had some other baggage on you provided you were not eloping just kidding
Guess you were in a hurry and did backtrack. Happens to me sometimes as I did loose a CD player way back in 2001 on a plane leaving it in the pocket in front of my seat. Unfortunately when I reported it was gone and I'm still waiting.
Learnt a lesson, always carry light and not travel with gear that I will miss to death. So I use Sansa clip sport for all outside activity